66656066 has 16 divisors (see below), whose sum is σ = 105442560. Its totient is φ = 31515120.

The previous prime is 66656059. The next prime is 66656071. The reversal of 66656066 is 66065666.

It is a super-2 number, since 2×66656066² = 8886062269192712, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24431 + ... + 27021.

It is an arithmetic number, because the mean of its divisors is an integer number (6590160).

Almost surely, 2^66656066 is an apocalyptic number.

66656066 is a deficient number, since it is larger than the sum of its proper divisors (38786494).

66656066 is a wasteful number, since it uses less digits than its factorization.

66656066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 66656066 is about 8164.3166278630. The cubic root of 66656066 is about 405.4586401003.

The spelling of 66656066 in words is "sixty-six million, six hundred fifty-six thousand, sixty-six".